32 lines
797 B
Rust
32 lines
797 B
Rust
use futures::executor::block_on;
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use futures::future::Future;
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use std::task::Poll;
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/// This tests verifies (through miri) that self-referencing
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/// futures are not invalidated when joining them.
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#[test]
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fn futures_join_macro_self_referential() {
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block_on(async { futures::join!(yield_now(), trouble()) });
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}
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async fn trouble() {
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let lucky_number = 42;
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let problematic_variable = &lucky_number;
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yield_now().await;
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// problematic dereference
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let _ = { *problematic_variable };
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}
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fn yield_now() -> impl Future<Output = ()> {
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let mut yielded = false;
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std::future::poll_fn(move |cx| {
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if core::mem::replace(&mut yielded, true) {
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Poll::Ready(())
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} else {
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cx.waker().wake_by_ref();
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Poll::Pending
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}
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})
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}
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